Write a function that gives the mean digit (round towards nearest integer) of an input and positive number. For example:
x = 264 --> y = 4
x = 128 --> y = 4
Test Suite problem #4 has an incorrect value.
Test suite #4 is incorrect
Prime factor digits
Filter AC, pass DC
Calculate the area of a triangle between three points
Penny flipping - calculate winning probability (easy)
frame of the matrix
Ratio between sum of primes and sum of factors
Check if is a square
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
Approximate the inverse tangent by power series
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